Skip to main content

Re: [MW:17819] Radiographic Film Interpretation Excess Penetration..

By Materials & Welding
There is some lack of information in your inquiry email.
 
Question1: RT defect indication was of how much length in the film ? Was it a girth weld ? 
 
Question2: The inspector who rejected the film, gave you the answer or justification that why he is rejecting or giving repair, can you explain his way of answer ?
 
Question3: As you have mentioned in your email that inspector has measured the defect with the use of ruler.
How he has mesured the dimension of the defect (that is widthwise or lenghwise across the film or by any calculation) ?
What was his conclusion / final measurement length / depth of weld reinforcement after measuring ?
 
Question4: What was the welding process ?
 
Question5: Was there any access in the inside of the pipe to measure actual weld reinforcement ?
 
Queston6: What was the pipe thickness ?
 
Please refer my reply point wise.
 
Point No.1: Rejection should always be based on some measurable basis / or by some written reference while referring the code.
Point No.2: Can anyone explain the technique, how the depth of weld reinforcement be measured from RT film ?
 
Point No.3: API 1104 is silent about RT acceptance criteria for weld reinforcement.
 
Point No.4: Refer Appendix A of API 1104 (A 5.1) for the limitations / inaccauaracy of RT for evaluating such defect. (Proper Justification is required from inspector for rejection)
 
Point No.5: If the inspector is unable to explain the calculation he made, I think he has no right to reject the film.
 
Point No.6: API 1104 is allowing some major welding defects like Incomplete penetration, Incom. Fusion etc., then the weld refinforcement would not be a cause of rejection only by assuming & if not measurable.
 
Point No.7: Clause no. 13.8.4 Rejection Based On Reinforcement, is for Automatic welding without filler metal addtions (e.g. flash butt welding process)  - Was pipe welding process is the same ?
 
Best Regards
 
Hiren Sevak
On Mon, May 27, 2013 at 11:58 AM, Dominic v.k.dominic <v.k.dominic@gmail.com> wrote:
Dear Expertise,

I have this issue please anyone clarify me,
One QA/QC- Inspector 20 years Experience person  he rejected one 24" pipe line  RT film   because of excessive penetration by measuring the dimension with a ruler and required the joint to be repaired..
This is Acceptable or Not Acceptable.
if Acceptable where is mentioned the code?
Please clarify me, Because my management take this issue very serious  

Best Regards 
Dominic V.K.

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
 
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
 
 

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
 
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
 
 

Comments

Post a Comment

Popular posts from this blog

Materails FAQs

By Materials & Welding
Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...
21 comments
Read more

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

By Materials & Welding
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
Post a Comment
Read more

Re: [MW:10788] ON PLOT PIPING & OFF PLOT PIPING

By Materials & Welding
Piping systems involved for the flow lines and gathering lines from the well head isolation valve to the production facility or processing plant isolation valve are determined as OFF PLOT. ON PLOT defines piping system in the processing plant and production platform. ANSI/ASME B31.4 applies for off plot piping system. B31.4 allows the use of either API 1104 or ASME section IX (as appropriate). However, occasionally, a very small system such as piping within 500 feet of a processing plant (some client also said 400 feet) may be declared B31.3 rather than B31.4. When B31.3 is invoked, only ASME Section IX is used. before you decide which code to use for welding procedure and/or welder qualification for pipe welding, you have to know the design and construction code applicable to the system. Please read far enough into scope and diagram illustrating the application of either B31.3 and B31.4 hope this helps rgds 2011/4/21 pradip kumar sil < pradipsil@gmail.com > Dear all, ...
Post a Comment
Read more